Fujitsu PRIMERGY TX2550 M4 Upgrade And Maintenance Manual page 71

Basic hardware procedures
Figure 22: Installing the top cover (rack model) (A)
Ê Open the locking lever on the top cover.
Ê Lower the top cover onto the chassis, recessed by 2 cm.
Figure 23: Installing the top cover (rack model) (B)
Ê Close the locking lever on the top cover (1). This will slide the top cover shut
engaging the locking mechanism (2).
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TX2550 M4 Upgrade and Maintenance Manual